Shuttle casing for sewing machines



Jan. 19,1926. 1,570,075

G. G. PAINE SX'IU'I'TLE CASING FOR SEWING MACHINES Filed April 4, 1923 ATTOi/VLYS.

latentecl Jan. 19, 1926.

UNITED STATES GEORGE Gr. PAINE, 0F LUDLOW, KENTUCKY.

' SHUTTLE CASING FOR SEWING MACHINES.

Application filed April 4, 1923.

To all whom 5t may concern 8 Be itknown that I, Gnoncn G. PAINE, a citizenbfthe United States, and a resident of L'udlow, inthe county of Kenton and State of Kentucky, have invented certain new and useful Improvements in Shuttle Casings for Sewing Machines, of which the following is a full, clear, and exact description, reference being had to the accom panying' drawing, forming part of this specification.

The object of my invention is to improve theshuttle holder for the Singer type of sewing machines and particularly for that type of Singer machine employed for automatic tacking in which the machine upon being started takes a limited number of 1 stitches, stops automatically and cutting knives then automatically sweep across the top ofthe race-way and sever the needle and the bobbin thread. '1 In the construction of shuttle race heretofore employed in such machines the shuttle holder is cut away entirely at the top to provide suflicient space for the point of the shuttle to catch and throw off the loop of the thread and the cutting knives play across this open space, or where an attempt has been made to bridge the open space partially by a bridge plate it has always been found difiicult to prevent the thread from becoming jammed at the corner of the bridge and to maintain sufficient tautness of the thread to permit the knives to sever the thread close up to the goods.

Heretofore frequent trouble has been experienced in the operation of such automatic tacking machines by the threads catching and breaking or by the knives failing to sever thethreads close to the goods.

It is the object of my invention to overcome these defectsand to provide a construction in which the liability of the threads catching or the knives failing to cut the thread olf short is reduced to a minimum.

This I accomplish by that certain novel construction to be hereinafter particularly pointed out and claimed in the specification and claims that follow.

In the drawings:

Figure 1 is a perspective View of my improved construction showing the location and relative position 0f the cutting knife mechanism, 1

Serial No. 629,747.

Figure 2 is a similar perspective view of the construction taken from theinside.

The shuttle holder 1 is of the usual 01rcular form provided with an internal pe which is held in position by the bobbin arm 6 which engages in the slot 7 in the casing, while the bobbin 8 is free to rotate in the bobbin case.

The top portion of the shuttle casing is cut away to leave a flat top 9 space over the bobbin case and this space is partly covered by a bridge plate 10, substantially a rectangular plate with a beveled corner 12 so that the point t of the shuttle in picking up the loop will carry the thread without any liability of catching over, the smooth slightly raised surface 13 of the casing and around the shuttle. Heretofore there has always been a chance that the thread with an open would catch in some sharp corner as it was so caught up by the shuttle, but my bridge plate with its diagonal edge merging into the smooth surface of the casing effectually prevents this.

The sewing needle carrying the needle thread, reciprocates back and forth through the hole 14 in the top plate 15 which is set in the top of the machine and upon which the goods to be sewed are fed, and the shuttle holder and other parts heretofore described are mounted in fixed position by the-screws 16, 16, in proper position for the needle action.

Underneath the plate 15 is secured the cutting knife the mechanism omitting the driving con- 17 for severing the needle and bobbin threads at the end of each sewing nections. I will make no attempt to describe this mechanism in detail, other than to say that at the proper time the cutting knife is operated automatically by mechanism not shown to swing across the top face 9 and the bridge plate 10 to sever the threads. As heretofore constructed, however, the sweep of the knife tends to carry the threads into some sharp corner and either Wedges the thread or the action tends to draw on the threads and not to sever them sharply With only short ends.

To remedy this defect I form a smooth upwardly extending groove 18 along the side face of the casing terminating in a transverse groove 19. The edges of these grooves are smooth so as not to present any sharp surface with the bridge plate terminating at the edge of the grooves, and the threads as they are met by the sweep of the knife are carried into these grooves so that there is no liability of catching and pulling out and a clean out is made by the knife, leaving very short ends.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent, is

In a device of the character specified the combination of a flat topped shuttle casing, a shuttle, a bridge plate, an admission aperture for a threaded needle in the shuttle casing, and a thread cutting knife, said flat topped casing cut-away adjacent the admission aperture, a diagonally edged bridge plate disposed on the flat topped shuttle casing, a radial groove at the front edge of the bridge plate and a transverse groove on the top of the casing adjacent the radial groove whereby said grooves receive the cut thread from the needle.

GEORGE G. PAINE. 

